The ocean is a large, saltwater areas constitute the basic components of the hydrosphere. Approximately 71% of the Earth's surface (approximately 361 million square kilometers) are covered oceans, a continuous body of water by custom is divided into several key ocean and some of the small sea. Over half of the area above 3,000 meters depth (9,800 ft). The average salinity of the ocean is about 35 parts per thousand (ppt) (3.5%) and nearly every type of sea water salinity ranged from 30 (in the vicinity pole) to 38 ppt (tropics /subtropical). Surface water temperature is off 29 ° C (84 ° F) in the environs of the equator down to 0 ° C (32 ° F) in the polar regions.
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